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D. BROOKS, Jr.

INSULATING ELECTRIC WIRES.

No. 340,931. Patented Apr. 27, 1886.

WITNESSES: 04.. (95

N. PETERS, Pmwumn hqr, Wam'mmom D. c,

UNITED STATES PATENT OFFICE.

DAVID BROOKS, JR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONEHALF TO HENRY B. TATHAM, OF SAME PLACE.

INSULATING ELECTRIC WIRES.

SPECIFICATION forming part of Letters Patent No.340,93l, dated April 27,1886.

Application filed November 5, 1885. Serial No. 181,891.

To aZZ whom it may concern Be it known that I, DAVID BROOKS, Jr., a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, haveinvented a new and useful Improvement in Insulating Electrical \Vires, which improvement is fully set forth in the following specification and accompanying drawings, in which I Figure 1 represents a perspective v1ew of electrical wires insulated in accordance with my invention. Figs.- 2 and 3 represent views of detached portions of the insulating means, on an enlarged scale.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of means for covering and separating insulated electrical wires, whereby induced currents are passed off, as will be hereinafter fully set forth.

Referring to the drawings, A represents a cable formed of a bu nch or number of wires for conducting electrical currents, the same having coverings of cotton or other fibrous material.

B represents a tape, which surrounds some of the central wires of the bunch, and C represents tapes, which are disposed in the bunch so as to extend from the tape B or the center of the cable to the periphery thereof.

The tapes B O are made of threads D, formed of strands E of fibrous material,with a thin strip of metal or wire, F, wrapped spirally thereon, leaving small spaces of the strand between the wrappiugs uncovered. The threads D are woven or braided together, forming the tapes B or O. After the wires and tapes are properly put together-,the bunch as formed is wrapped with a tape, G, formed of strands H of librous material, and a few strips of metal or wire, J, interwoven or braided therewith, said tape G being in contact with the edges of the tapes O at the periphery of the bunch A. The cable as now formed is inclosed in a lead pipe or incasement, K, and properly saturated with an insulating compound.

The partly metal and fibrous tapes provide a large metallic surface, which is light in weight and of flexible nature. The tapes B Oin the bunch of wires carry ofi the induced currents to the tape G, and thus to the lead pipe or incasement; but the tape G may be dispensed with, in which case the tapes 0 Wlll (N0 model.)

be in contact with the pipe or incasement K; but the tape G will be found serviceable for binding the bunch of wires and preventing separation thereof.

As an insulating compound I use rosin and rosin oil, the latter being preferably that known as the first run, taking three parts of rosin and one part of rosin-oil, and combining the same, forming a cheap, durable, flexible, and highly-insulating material.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an electric conductor, a woven or braided tape composed of threads of fibrous material and metallic wire coiled thereon, substantially as and for the purpose set forth.

2. A bunch of insulated wires with flexible tapes formed of fibrous material and me tallic strips or wire interposed between said insulated wires, and having their edges exposed at the surface of the bunch,substantially as described.

8. A cable formed of a bunch of fibrous covered wires with tapes formed offibrous material and metallic strips or wire, and exterior incasement, and an insulating material, for the purpose set forth.

4. In an electric conductor, a woven or braided tape composed of threads of fibrous material and metallic wire coiled thereon, the coils having spaces between the same, substantially as and for the purpose set forth.

5. Acable formed of wires having between portions of the same tapes or braids composed of threads of fibrous materials with metal strips wrapped spirally on said threads, the edges of the said metal strips not being in contact, substantially as described.

6. A cable formed of wires E, the tape 13, surrounding the wires at the central portion of the cable, and tape O, extending from the tape 13 to the periphery of the cable, substantially as described.

7. In an electric conductor, a woven or braided tape formed of threads of fibrous material having metallic wire coiled thereon, the said braid placed between the electric wires and having its edges exposed at the surface of the bunch, substantially as and for the purpose set forth.

Nitnesses: DAVID BROOKS, JR.

JOHN A. \VIEDERsHEIM,

A. P. GRANT. 

